EPGardening Natural Resin Plant Caddy/Dolly,Black Outside diameter:12.8",Inner diameter:11.8" The excess water would go into plastic box,which can effectively prevent roots rotted and keep the pot and floor clean and tidy Designed with universal wheels,easy to move and rotate,sturdy and durable,not easy to scratch your floor Net design,based on the principle of mechanical structure,better makes the tray strong(super load-bearing capacity) Thickened material,sturdy and durable.Smooth surface,easy to clean